AutoCodes – GMC – P27A9 2014 GMC Sierra

P27A9 2014 GMC Sierra Code - Transmission Control Solenoid Valve 3 Calibration Incorrect

Quick Answer

The Transmission Control Solenoid Valve 1, 2, 3, 4, 5, 6, 7 have a unique current versus oil pressure characteristic that is used to properly upshift or downshift the transmission. Common causes include Solenoid Valve Characterization Reprogramming. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P27A9 2014 GMC Sierra indicates Transmission Control Solenoid Valve 3 Calibration Incorrect.
Common causes: Common causes include Solenoid Valve Characterization Reprogramming.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 185

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Sep 22, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P27A9 2014 GMC Sierra Description

The Transmission Control Solenoid Valve 1, 2, 3, 4, 5, 6, 7 have a unique current versus oil pressure characteristic that is used to properly upshift or downshift the transmission. The data for each solenoid valve is programmed into the Transmission Control Module (TCM). The Diagnostic Trouble Code (DTC) will be set when the Transmission Control Solenoid Valve Calibration Data has not been programmed.

OBDII Code P27A9 2014 GMC Sierra - Transmission Control Solenoid Valve 3 Calibration Incorrect - AutoCodes.com — P27A9 2014 GMC Sierra Code - Transmission Control Solenoid Valve 3 Calibration Incorrect

What does this mean?

What are the Possible Causes of the DTC P27A9 2014 GMC Sierra?

Solenoid Valve Characterization Reprogramming

How to Fix the DTC P27A9 2014 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P27A9 2014 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P27A9 2014 GMC Sierra code?

Need more information on how to fix the P27A9 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P27A9 2014 GMC Sierra Code

1. What does OBDII code P27A9 mean on a 2014 GMC Sierra?

P27A9 indicates that the Transmission Control Module (TCM) has detected an incorrect calibration in Transmission Control Solenoid Valve 3.

2. What are the common symptoms of code P27A9 in a 2014 GMC Sierra?

Symptoms may include harsh shifting, delayed gear engagement, transmission slipping, or the check engine light being illuminated.

3. What causes code P27A9 to appear in a 2014 GMC Sierra?

Common causes include a faulty transmission control solenoid, incorrect TCM calibration, wiring or connector issues, or a failing transmission control module.

4. Can I drive my 2014 GMC Sierra with code P27A9?

Driving with this code is not recommended as it may lead to further transmission damage or unsafe driving conditions.

5. How is code P27A9 diagnosed on a 2014 GMC Sierra?

A technician will use a scan tool to read the code, check the TCM calibration, inspect the transmission wiring and connectors, and test the solenoid's functionality.

6. Can code P27A9 be fixed with a simple software update?

In some cases, reprogramming or updating the Transmission Control Module (TCM) software can resolve the issue if incorrect calibration is the root cause.

7. How much does it cost to repair code P27A9 on a 2014 GMC Sierra?

Repair costs vary, but reprogramming the TCM may cost $100â€“$300, while replacing a transmission solenoid could cost $200â€“$500 depending on labor and parts.

8. Does code P27A9 mean the transmission is failing?

Not necessarily. The issue could be related to a solenoid or calibration problem and not a full transmission failure.

9. What tools are needed to fix code P27A9 on a 2014 GMC Sierra?

Tools may include an OBDII scanner, a multimeter for electrical testing, and potentially specialized tools for accessing and replacing solenoids.

10. Can I fix code P27A9 on my 2014 GMC Sierra myself?

If you have experience with automotive diagnostics and repairs, you may be able to fix it by addressing wiring issues or replacing the solenoid, but TCM reprogramming typically requires professional equipment.